Please help. My Performer 405 loses suction for about 30 minutes and then it slowly comes back. It has happened now about 3 times, but only on larger jobs of 4-5 rooms or more. It will be going fine, and then over the span of about 1 minute, the suction goes from full to almost nothing. I empty the tank, check the seals, clean the inline filter, and no change. Each time, I've had to wait about 30 minutes for it.